Switched from the composite to an HDMI cable on my Xbox 360 this week and it's been causing me fits. The video will cut out completely after a wile (usually an hour) and will only come back after shutting it down and starting it back up again. Seems to only do it wile playing games as I tried it during movie playback and would only flicker a couple of times but not cut out completely. Any thoughts? I've tried 3 different HDMI cables so it's not that and I've tried a couple of ports on the TV.